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Mathbox for David A. Wheeler |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > i2linesi | Structured version Visualization version GIF version |
Description: Solve for the intersection of two lines expressed in Y = MX+B form (note that the lines cannot be vertical). Here we use inference form. We just solve for X, since Y can be trivially found by using X. This is an example of how to use the algebra helpers. Notice that because this proof uses algebra helpers, the main steps of the proof are higher level and easier to follow by a human reader. (Contributed by David A. Wheeler, 11-Oct-2018.) |
Ref | Expression |
---|---|
i2linesi.1 | โข ๐ด โ โ |
i2linesi.2 | โข ๐ต โ โ |
i2linesi.3 | โข ๐ถ โ โ |
i2linesi.4 | โข ๐ท โ โ |
i2linesi.5 | โข ๐ โ โ |
i2linesi.6 | โข ๐ = ((๐ด ยท ๐) + ๐ต) |
i2linesi.7 | โข ๐ = ((๐ถ ยท ๐) + ๐ท) |
i2linesi.8 | โข (๐ด โ ๐ถ) โ 0 |
Ref | Expression |
---|---|
i2linesi | โข ๐ = ((๐ท โ ๐ต) / (๐ด โ ๐ถ)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | i2linesi.1 | . . 3 โข ๐ด โ โ | |
2 | i2linesi.3 | . . 3 โข ๐ถ โ โ | |
3 | 1, 2 | subcli 11540 | . 2 โข (๐ด โ ๐ถ) โ โ |
4 | i2linesi.5 | . 2 โข ๐ โ โ | |
5 | i2linesi.8 | . 2 โข (๐ด โ ๐ถ) โ 0 | |
6 | 2, 4 | mulcli 11225 | . . . 4 โข (๐ถ ยท ๐) โ โ |
7 | i2linesi.4 | . . . . 5 โข ๐ท โ โ | |
8 | i2linesi.2 | . . . . 5 โข ๐ต โ โ | |
9 | 7, 8 | subcli 11540 | . . . 4 โข (๐ท โ ๐ต) โ โ |
10 | 1, 4 | mulcli 11225 | . . . . . 6 โข (๐ด ยท ๐) โ โ |
11 | i2linesi.6 | . . . . . . 7 โข ๐ = ((๐ด ยท ๐) + ๐ต) | |
12 | i2linesi.7 | . . . . . . 7 โข ๐ = ((๐ถ ยท ๐) + ๐ท) | |
13 | 11, 12 | eqtr3i 2756 | . . . . . 6 โข ((๐ด ยท ๐) + ๐ต) = ((๐ถ ยท ๐) + ๐ท) |
14 | 10, 8, 13 | mvlraddi 48088 | . . . . 5 โข (๐ด ยท ๐) = (((๐ถ ยท ๐) + ๐ท) โ ๐ต) |
15 | 6, 7, 8, 14 | assraddsubi 48090 | . . . 4 โข (๐ด ยท ๐) = ((๐ถ ยท ๐) + (๐ท โ ๐ต)) |
16 | 6, 9, 15 | mvrladdi 48089 | . . 3 โข ((๐ด ยท ๐) โ (๐ถ ยท ๐)) = (๐ท โ ๐ต) |
17 | 1, 4, 2, 16 | joinlmulsubmuli 48093 | . 2 โข ((๐ด โ ๐ถ) ยท ๐) = (๐ท โ ๐ต) |
18 | 3, 4, 5, 17 | mvllmuli 12051 | 1 โข ๐ = ((๐ท โ ๐ต) / (๐ด โ ๐ถ)) |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1533 โ wcel 2098 โ wne 2934 (class class class)co 7405 โcc 11110 0cc0 11112 + caddc 11115 ยท cmul 11117 โ cmin 11448 / cdiv 11875 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2163 ax-ext 2697 ax-sep 5292 ax-nul 5299 ax-pow 5356 ax-pr 5420 ax-un 7722 ax-resscn 11169 ax-1cn 11170 ax-icn 11171 ax-addcl 11172 ax-addrcl 11173 ax-mulcl 11174 ax-mulrcl 11175 ax-mulcom 11176 ax-addass 11177 ax-mulass 11178 ax-distr 11179 ax-i2m1 11180 ax-1ne0 11181 ax-1rid 11182 ax-rnegex 11183 ax-rrecex 11184 ax-cnre 11185 ax-pre-lttri 11186 ax-pre-lttrn 11187 ax-pre-ltadd 11188 ax-pre-mulgt0 11189 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2528 df-eu 2557 df-clab 2704 df-cleq 2718 df-clel 2804 df-nfc 2879 df-ne 2935 df-nel 3041 df-ral 3056 df-rex 3065 df-rmo 3370 df-reu 3371 df-rab 3427 df-v 3470 df-sbc 3773 df-csb 3889 df-dif 3946 df-un 3948 df-in 3950 df-ss 3960 df-nul 4318 df-if 4524 df-pw 4599 df-sn 4624 df-pr 4626 df-op 4630 df-uni 4903 df-br 5142 df-opab 5204 df-mpt 5225 df-id 5567 df-po 5581 df-so 5582 df-xp 5675 df-rel 5676 df-cnv 5677 df-co 5678 df-dm 5679 df-rn 5680 df-res 5681 df-ima 5682 df-iota 6489 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-riota 7361 df-ov 7408 df-oprab 7409 df-mpo 7410 df-er 8705 df-en 8942 df-dom 8943 df-sdom 8944 df-pnf 11254 df-mnf 11255 df-xr 11256 df-ltxr 11257 df-le 11258 df-sub 11450 df-neg 11451 df-div 11876 |
This theorem is referenced by: (None) |
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