You already have x isolated in the second one so you just fill that in for the first one and get y+4+y=6. Then you simplify and get that y=1 and because only one of the answer choices shows that, you just pick that choice which is (5,1).
Step 1: Add 9 to both sides.<span><span><span><span><span>−<span>4x</span></span>+<span>9y</span></span>−9</span>+9</span>=<span>0+9</span></span><span><span><span>−<span>4x</span></span>+<span>9y</span></span>=9</span>Step 2: Add -9y to both sides.<span><span><span><span>−<span>4x</span></span>+<span>9y</span></span>+<span>−<span>9y</span></span></span>=<span>9+<span>−<span>9y</span></span></span></span><span><span>−<span>4x</span></span>=<span><span>−<span>9y</span></span>+9</span></span>Step 3: Divide both sides by -4.<span><span><span>−<span>4x</span></span><span>−4</span></span>=<span><span><span>−<span>9y</span></span>+9</span><span>−4</span></span></span><span>x=<span><span><span>94</span>y</span>+<span><span>−9</span>4</span></span></span>Answer:<span>x=<span><span><span>94</span>y</span>+<span><span>−9</span><span>4</span></span></span></span>
